: tonight, the head of the central intelligence agency, david petraeus, made himself blackmail material. what did the white house know? and when can they know it? petraeus resigned after admitting to cheating on his wife. raising more questions than answers. why now? days before he was set to testify about four dead americans in libya. >> the terror attack, benghazi, has put a lot of pressure on this white house. and a lot of pressure on senior intelligence officials, like general david petraeus. thls a complete surprise, though. >> the timing is just too perfect for the obama administration. just as the administration claimed that there was purely coincidence that our benghazi conflict attack was on the anniversary of september 11. now it's purely coincidence that this extra-marital affair surfaces right after the election -- want before, but right after, but before the intelligence chief goes to capitol hill to get grilled. >> we had heard he may have resigned for personal reasons. one of those reasons was the possibility of an extra-marital affair. we are confirmed it because a lette